What do you say/do when your mom tells you that she bought slippers for your dad for x-mas today and you just that afternoon told her that YOU had bought him slippers* as a present??
Well, you yell "oh, thanks alot" and storm off like a 10-year old taking a temper tantrun. That's what you do.
* Keep in mind that comments regarding how lame slippers as a present are will be held against you, and you will get slippers from me for every holiday until the day you die. I swear.